help with keyless entry

i have a 08 silverado and was wandering if to key fobs can be programmed to my truck.
i have 2 fobs would b nice if i could get both of them to work so wife could have one.
when i program one it cancles the other out. and help would b nice thanks

To learn multiple remotes, you have to follow the learn procedure and do it for both remotes in the same main procedure. The procedure probably involves hitting both the lock and unlock buttons simultaneously on the remote, once you learn the first one you immediately have to learn the second.